The girls of 765 Production Studio are eagerly preparing for the International Music Festival on Vacation Island. Coupled with an amusement park and a high-class resort, the festival promises several days of fun for everyone. That is, until their producer announces that they only have enough room for one unit to participate. In three different scenarios where everyone is split into three groups, one of the three is chosen to partake in the International Music Festival, where they are treated to a three-day vacation before starring in the festival's concert. From the moment they step off the boat until the main event, each group of girls experiences the festival in their own way, excited to take part in the highly anticipated performance.

On a rainy morning in Tokyo, Takao Akizuki, an aspiring shoemaker, decides to skip class to sketch designs in a beautiful garden. This is where he meets Yukari Yukino, a beautiful yet mysterious woman, for the very first time. Offering to make her new shoes, Takao continues to meet with Yukari throughout the rainy season, and without even realizing it, the two are able to alleviate the worries hidden in their hearts just by being with each other. However, their personal struggles have not disappeared completely, and as the end of the rainy season approaches, their relationship will be put to the test.

In the distant future, trains are no longer bound by their physical tracks. Instead, they take to the skies and travel across the universe on the Galaxy Railways, transporting mankind from planet to planet. However, the Galaxy Railways are no safer than traditional trains: criminals, terrorists, and vile aliens always find a way to stir up trouble. Manabu Yuuki, a rash and hot-headed man, is the latest addition to the Galaxy Railways' elite Space Defence Force (SDF). These brave men and women are responsible for protecting the railways and responding to any unprecedented danger, risking their lives to protect the innocent from evil. But as this drama unfolds and the SDF's greatest crisis draws nearer, Manabu must truly learn what it means to be a member of the SDF before it is too late.

Dr. Watson has created his masterpiece – a beautiful woman made of metal. A wonder of science, Antoinette is a childlike innocent who holds the key to an ancient civilization that could save the world, or destroy it. And when a mad tyrant kidnaps the man she loves, Antoinette finally discovers the courage – and the amazing fighting skills – that are her true calling.